package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderDetailMapper;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;

import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j

public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;
    /**
     * 营业额统计
     * @return
     */
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //这个列表是用来存放从begin到end的每一天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            //日期加1
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //这个列表用来存放从begin到end的每天营业额
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            //查询date当天的营业额，订单状态是5
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            //select sum(amount) from orders where order_time >= beginTime and order_time < endTime and status = 5
            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);

        }

        return new TurnoverReportVO().builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }
    /**
     * 用户统计
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //这个列表是用来存放从begin到end的每一天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            //日期加1
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //这个列表用来存放从begin到end的每天新增用户数 select count(id) from user where create_time >= beginTime and create_time < endTime
        List<Integer> newUserList = new ArrayList<>();
        //这个列表用来存放从begin到end的每天总用户数 select count(id) from user where create_time >= beginTime
        List<Integer> totalUserList = new ArrayList<>();
        for (LocalDate date : dateList) {
            //查询date当天的用户数据
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            map.put("end", endTime);
            Integer totalUser = userMapper.countByMap(map);

            map.put("begin", beginTime);
            Integer newUser = userMapper.countByMap(map);

            newUserList.add(newUser);
            totalUserList.add(totalUser);
        }
        return new UserReportVO().builder()
                .dateList(StringUtils.join(dateList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .build();
    }
    /**
     * 订单统计
     * @return
     */
    @Override
    public OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end) {
        //这个列表是用来存放从begin到end的每一天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            //日期加1
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //历遍dateList查询每天的订单总数和有效订单数
        List<Integer> orderCountList = new ArrayList<>();
        List<Integer> validOrderCountList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            //统计每天的订单总数 select count(id) from orders where order_time >= beginTime and order_time < endTime
            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            Integer orderCount = orderMapper.countByMap(map);

            //统计每天的有效订单数 select count(id) from orders where order_time >= beginTime and order_time < endTime and status = 5
            map.put("status", Orders.COMPLETED);
            Integer validOrderCount = orderMapper.countByMap(map);
            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }
        //计算时间区间内的订单总数
        Integer orderCount = orderCountList.stream().reduce(Integer::sum).get();
        //计算时间区间内的有效订单数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
        //计算订单完成率
        Double orderCompletionRate = 0.0;
        if (orderCount != 0) {
            orderCompletionRate = validOrderCount.doubleValue() / orderCount;
        }
        return new OrderReportVO().builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(orderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }
    /**
     * 销量排名 top10
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> goodsSalesList = orderMapper.getSalesTop10(beginTime, endTime);

        List<String> names = goodsSalesList.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");

        List<Integer> numbers = goodsSalesList.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");
        return new SalesTop10ReportVO().builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }
    /**
     * 导出运营数据报表
     * @param response
     */
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        //1.查询数据库，获取营业数据
        //获得最近30天的开始时间
        LocalDate begin = LocalDate.now().minusDays(30);
        //获得最近30天的结束时间
        LocalDate end = LocalDate.now().minusDays(1);
        //查询概览数据
        BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(begin, LocalTime.MIN), LocalDateTime.of(end, LocalTime.MAX));

        //2.通过POI将营业数据写入到Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
        //基于我们的模版文件创建新的Excel工作簿对象
            XSSFWorkbook excel = new XSSFWorkbook(in);
            XSSFSheet sheet1 = excel.getSheet("Sheet1");
            XSSFRow row = sheet1.getRow(1);
            row.getCell(1).setCellValue("时间：" + begin + "至" + end);
            sheet1.getRow(3).getCell(2).setCellValue(businessData.getTurnover());
            sheet1.getRow(3).getCell(4).setCellValue(businessData.getOrderCompletionRate());
            sheet1.getRow(3).getCell(6).setCellValue(businessData.getNewUsers());
            sheet1.getRow(4).getCell(2).setCellValue(businessData.getValidOrderCount());
            sheet1.getRow(4).getCell(4).setCellValue(businessData.getUnitPrice());
            //填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = begin.plusDays(i);
                BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                //获得每一行
                row = sheet1.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessDataVO.getTurnover());
                row.getCell(3).setCellValue(businessDataVO.getValidOrderCount());
                row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessDataVO.getUnitPrice());
                row.getCell(6).setCellValue(businessDataVO.getNewUsers());
            }
        //3.将Excel文件下载到客户机
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();

        } catch (IOException e) {
            throw new RuntimeException(e);
        }



    }
}
